Sth about Python 07 ---functions

1.局部变量和全局变量的作用域

x = 1
def func():
x = 2
print x
func()
print x
输出：2
1

x = 1
def func():
x = 2
print x
输出：1

x = 1
def func():
global x
x = 2
print x
func()
print x
输出：2
2